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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697b71e1b5c4a9b6708059ca222404ca35e76eaa1ff8f114f96e69768997f458' 
  AND token = 'JUE+DmbWaTlcsuSIYLipAvt40POON29gNBq+ta/Fq0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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