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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342c6c613919385736ff597572bc96ca0648b980a8258b3a31a2c0902b34ae61' 
  AND token = 'CyhD7b1t57RnUNOAcH7gSSd/sqv1uXKA+kMx9KGHywA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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