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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad7fe97e13782b71690cd196866b0d4b4d66e5fc686d7477f06f456cc792365' 
  AND token = 'zn+a2jq8jePbWS2IkIz6C2Dmvf/e4ItWlGHsDeCsiZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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