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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71066604af0d06ffc4d98a1b83c4220d5f3357bed81be791426a35f394384922' 
  AND token = 'zL5HG56Sst4wNkvIs1HtuAJemKALWcP4SoWdTJMI8y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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