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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa6ab8b24c4b3e717c54eb6f954fa080bc3e0e6e57894b21e6896c2cfab72ab' 
  AND token = 'CaDU9Ew6o1D/qMifS9Kk3CPhR2uMzl3zglLD6yQvxwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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