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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faea6beeca23e2e53de62650247f855ff8e55b8aabfc8f1b0f1818dfd4a27de1' 
  AND token = 'UkOp1cpDLRYXRYVVyxhD8JyjXGNz6wf8wnGzQhvnS0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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