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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9cd276a2f53401f8fa3d755c0d145c4dde540e1e4a6b13f893be47b1ac4e84' 
  AND token = 'u3pyT/TLeoDk/6SwP6V99USmRo34Mm/LzYP41goRBcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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