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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadd9d97475cca58bd25acc884daeaa489e637a0a8083d2d232c10cb58f9e885' 
  AND token = 'nw+WgZkYfBRlE1la9BoPx9E89MUP0anNsHy9sCU4Hmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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