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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3ee3b39769cb2938f5dac0b0a65dc00300c8bbd6a9689889818a814ed62e0a' 
  AND token = 'FdGv6uMO7e636HtA1XoSe4rRgCTDO2GdV7Ch9GsanKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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