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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18ea87a996b4472f2a921445c4c06417abc68f00a52bb142bc2779467901fe4' 
  AND token = 'dnWpY4WWxOB5gMg0Zjwa2IBu4aWoOxt9PUniEaOodTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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