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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033a9cea29166690f3939f7b34ed2b4dc5f7a30e7e30d3a6a4fd5c135b4b9720' 
  AND token = 'MHKXEbMF8xa4CxXkN1PBw8uArCHsu8E4/eaD/m1Uvi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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