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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d8f7d4749b9974496735ba27ebc1a0559cfc6c104360db49cb08f9dfefbc51' 
  AND token = '+eChBt11biXW4CQf3TAvPmwMfYny/8L4ZRnV53+qX2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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