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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b78446e5e69e23132b568960cdb6794503c516d46560a60302b3c2f4cdd09bb' 
  AND token = 'JnTLU6vOIkIwVdN14Y7wDVrB3L59ZuJU5rgAlS/SjoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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