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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585e77ea4cbd9732e0f3ba3fa152c29b1a1f64eb89bf5e0c99a4587d6910a466' 
  AND token = 's2zocDhHQlSfmvIK6loNPbqPdtnpw1Fw0y9Ms6QhvO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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