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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b6fa93893559e99a9bd597b67e391f724a387f09bab751c2d18b2f0c8ee6c5' 
  AND token = 'tsvtM9nr+6kksrCglXR0gKCmZIeFPE54f3jVc1AYbWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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