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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb63ea8cd694c39025dd3559063ad5ceb9fa35147e6f8ab114c84899f4eae134' 
  AND token = 'tjYn0Uev3Vvt9V/q3en469Kyvf6JtUVrGoUZNJ9ol2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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