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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04d528c481f6064529fe60f49a888e558509041a8549f0f19159c28e7736939' 
  AND token = 'psXWfkOsg2+NMxW62wWKAmDmx1apbP5UVOlnaBzBIZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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