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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daeaa6540b828ae8c270e5f16d934aa2e92ed972a1885a0ad36a7f2a0c4572d' 
  AND token = '+T1bI9Y19JuuT0aGhkTTWq/5Fl5LmUCVBt65sE6+DPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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