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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce903d25862ac730348b3336fe3925345ff6c1f5bbafe0779beb3b2240c813d9' 
  AND token = '8Jno5GEZupvYmu3ZKODkw0zz7SRMaCNP+eH22jmCnHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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