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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f227aca5c8047b25fbff9b3f9b4a3a507a08afb85ed3d2a2767af1a64be608a' 
  AND token = 'FhsRxj+aaAjK1ND44IbCQTIBOv9a5/RHcDQXpYW4U6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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