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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18dffe7c7feb3799411da683e9e882145019cb99e18ab09eeb877b839ae3e93e' 
  AND token = 'X9UCvl6En2wrF5Jp6m85+r8pjgVJH5JgyZCrM4OCk0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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