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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7186821f7069b68546c49dea1f812b3302d30642392b9a158e83c3a6d3cf22b' 
  AND token = 'dcQlQDwkiy+l+TNr51JMzeJ6wtF98eqfBeSGqSx0h0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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