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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc322ce948b7f1959ee2cd3992990ffe93334b32109010dc6fa4db02262816a9' 
  AND token = 'ElekqnM7xPqUv7WbOnl6ocXdOrEjrGV6g2ebiyofPbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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