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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53274c79c82ca1c8e009dba821e5e114bc06c20b69ae2300b7e26e4160d06931' 
  AND token = 'DKwloo5uR0sULlqd9Ujdp06xJ8GcTb7e/QsZ2aJquV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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