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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd132fd6d56caa48d59adb9bf1c774c237b3f6bb925390e0c59c0e39c3035e3d3' 
  AND token = 'DzedRz5c8QfgchR/0ekPLUN72vmB3BeOA6wkbJO9/Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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