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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f992df6c43450f51f5d73845a09fe61f2702438e08ad4364bf4bb5495d578bc2' 
  AND token = '5vsYLd3yKlOWrX65ith3jrxakh4PIunhkdAshHEeWO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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