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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a21e96a38c882cd8ad40279052073ad8d842b0f2d7150a10c00d87c0320aab' 
  AND token = '0S8jOMzW4f3wB5ze2ShYGoWRC8wil3nLM4cN06iBxaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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