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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0d7c6246bcd431ca3e3b9bd1f0f30cdbe80f99177c76b4ea270419fa20d1c9' 
  AND token = 'Rp6jYue7w4yYpwWvQHxysRo+2K2mzwTPw1x2l3iHcko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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