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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937342315bd15c6e41a7b5b97092cbdeaf736dd767b561b5520c943ac0a6a624' 
  AND token = 'Au8WGohMnHhrLEU9UNZ0fz9THpODb2s0frTEORP98ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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