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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25ef6acebdc690f44e51b70c6e56c219ef1f2d120aaeddc1d08432448bd2177' 
  AND token = '4aG3oqX4s9UnYQ9E9HBtK59+FxnFkvfyzM09zKM2qNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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