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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b588ad458c3a6546eabdd29f8733639d444d1c4a406035dd8899222089a17dd' 
  AND token = 'KL5Jnrk2WXRbn2ZeS9eazPPtjdb7yOZloPmGTpkmFzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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