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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633c4bc816fb05dbf7b946877e68928e48ed8dd7ae8aa276aed4449aa1ed2bbd' 
  AND token = '41+GxKfxV9rx3mbpQV/d+lIUxb5CF3XelnLEnYezPP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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