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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a5aa6ed88c7e688e065ab0e938e3b60c0ba226f3cf672a85be51c012024b04' 
  AND token = 'uUzdasH0o/a3iW1+DPtfEc7Y7vfqhTFZZLWKoLthUvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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