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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa656fc98524d7110568bfbb989011e263b80f875bf75b3168febc3beb97f895' 
  AND token = 'T8tJG1wU9PKUmZRsmLW12rHl79dpy8tNzq2Q/t6/D9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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