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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdbf3651875f5517bbfc03fc713e1bf41dd690753af4e9dbf24216f4190bfef' 
  AND token = 'x9VIabOzPRs8c2N94jIvo+nlj8Ac+6cOarDq0goev60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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