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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed872f8a415b9bf3f1a6e4c4d14152f6a0fa2ef73585f8944bbdbbdd8a006a8d' 
  AND token = 'OFDIh4nXYYpU3Y1wvhl31FgXj+piKfxQThpeQXhle0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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