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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35096ad90b2314e35ea7aea6e34dc6e2ddc07dfbd7a1ada7defaa2ea6863174b' 
  AND token = 'jPPFX4Ph8DZ3OgUF5msOoj00s0CUuj7Q6HBvMyMv9do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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