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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fe335516a086acc1868054e99f906fd928d2a202a5bc17f9222185f0380c22' 
  AND token = 'FHAtQWs61BEU098NRaEwYju5NuqVJZdYdHmThYT4x/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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