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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b4febe362458f0921973e202ca54afa1d3f533f7e63fea9d335003e5f33139' 
  AND token = 'VtW6zf/rdD3gHbGbtt+tld1kiciaE2UdGCaXaWaEb7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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