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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca1eda84846393aae242baa4b4963a79f923d6551b7ec2cdf1c59c594821cd3' 
  AND token = '3J+2brXVaAOAEMc5zSuYk5wDmXvxwpek2pqiv652K04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}