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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6310c86cf4601db35b3d2a7199d5748230a504f025e1d3bcbd711174f838b682' 
  AND token = 'EEs5EFC/1JBWeakm+hFHgMjtXlDEp7a0SGtleVhGo3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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