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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fdb243f0956d3e206fd145f15212a25ad83c3ea79d4a8594b9a677a5f32a3f' 
  AND token = '+wadiuzJvTTuxi6MDCnPcbc77Q+9oEy5B8T4jtS/cF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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