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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68437faed69d0a0b5799095f68c1e6614bbacb7f27d398ac56e634e1b943e177' 
  AND token = 'l6cne44W1XA/MJ7BE4/71RPgo/iJa5QlDBBozO7uWwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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