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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e746cf914990dbfc7522332ae3c96bc01428888fa5a1d4f66a946be43f297a47' 
  AND token = '1pO8ySUK5jJwld44u5LIjd6SlpGK3urslr3y444dna4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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