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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f7d1e02b2d9d039a1c630354d8b558b151d5799931852890be8dcadb9377af' 
  AND token = 'XfvKntk7coICx9IuFInDCdLgbd0Wf6b216dVeRYKJrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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