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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90614c573c1523ae282b3e1e127095f834ee801d37f6b1c4974851b5f750c1ae' 
  AND token = '3+iG3pfbIjMVYQlm4UfJdnkFgbjNI3tnYCMrT1CCzG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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