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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac6379e38a458d78147207c63bb8c69eb8a714435a9e58ac56ee767e90d9f43' 
  AND token = '0x8E3W6PaSJEwNKe1w4VFoBnXw6ro0TX0uf3tYxO+F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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