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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25f28d74e90a3330cd6a1de770d410241661ce3e67adab74aa62ed03f2e57e1' 
  AND token = 'n06OeNkSF6gqzAR/jI/U47+XMDDlRgSgVkHPA9nJGns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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