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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba8bdd725f48198ad594c32b2589b05cb82f40ed0480b0b8df5c53bac84e61b' 
  AND token = 'UMK/QPasNmfgXRJ44jV6jlTh8qJ4dLv4brFeboQsC1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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