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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedbc205b41cf025b2105b1b17961483fb0d95e13efb4660d52f9324f395214e' 
  AND token = '26AHE6h1/rOueEFGMMfh9ZnkGEcsbUOQBmeuWIqaOpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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