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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eba91c4c269b0e73200a38a7cd2f7ecb3d782db95d96e5db5f510ad52e3b658' 
  AND token = 'E/5/O4NeDUjg0x3ebHdMeBopkviOKv4Bqfwf/i/kVXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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