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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61feb5a7fa9a40f90826b6277c2c40141af814ca6c7aba7e47d714a6a1a9d67d' 
  AND token = 'J33EkKU1AaRsmDHG/tWf0FolBZa+oBbSbg0moOFmp3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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