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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a59bb15674228d2a4401a127c48e0b9ee0be881a7699b7c76df6e84c66e0e0b' 
  AND token = 'RYuGCmDm/2RSFPLsi3DYOFWUHuP9BtdgVqA1JbbfbEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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