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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0168f2de636d5ae8eb6b3a07de5201520c0355d3b074f17414a6498a4a0c846' 
  AND token = 'Nvwfar8nchbrAWV0+1B4SLav5r3rYvOv17stUcowDqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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