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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b848373d130e3d309472798dca5002e56ec26b47409a9a28a6799c1e69ec53' 
  AND token = '+UXcyCF7zjdwgnAQMnLTRP+4YLeqfL8+pQmlom2Zr/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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