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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033bf61106df2b71f426a898ce8f90d3af334a57077c277f70102d72207d8a5e' 
  AND token = 'pvUop4LFjyXXv1XpCO4GDRTg9fSYlHb84FngJgWOIyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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