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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e62f54a20927e4e835b976ff8499a87dc82a39fc5c311e6d93ba2dd00a9089' 
  AND token = 'S5p33Bx9mcHW27ppa9Zt6UJie2QWDErAeFFckpBH7xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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