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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602a07ddbb9f80eb24efbecea80df7e55b3eeedc1148d50a0c5e74e159ce5e7b' 
  AND token = 'rRV3Hh07HZfriL+iQUp17kC8FBSZRLMV64ypRpW2Pm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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