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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5d3b57c7a592143036ea301c190a2302db424524968678e246a7d2a1115e24' 
  AND token = '4eGIbNz3QxsiFafWZuyvBYLzw4GQf6iz3UJI3pkDCxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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