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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5c0aa57dcfe23e1805266859d90d9b3dfee283a56d7bf6dda69782f8c509db' 
  AND token = 'jIF7WapIQVfZM5VM5iCYo2iaJPSSxcOPav3pPBBCO7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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