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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd2a24f92df76f3c1ba0eb13d066f0ef5f3c6f170e6511cfde4b2c9ed738ad0' 
  AND token = 'MVtftAFvA5/RU8Tr1eqvDqrC7t7vJYUg4t59wPMLl9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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