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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3a4c867fdfff8eb1df9833bb9d1c01e44047e28a6e61b6ab3b51cff2b17906' 
  AND token = 'z7FNE3ukrrfOyGfTLYOUZgWw4/RAZ+QesPaWgdeR5Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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